diff --git a/pkg/ui/workspaces/cluster-ui/src/statementDetails/statementDetails.tsx b/pkg/ui/workspaces/cluster-ui/src/statementDetails/statementDetails.tsx
index 5ca0f8bb5de6..2f1e6816483c 100644
--- a/pkg/ui/workspaces/cluster-ui/src/statementDetails/statementDetails.tsx
+++ b/pkg/ui/workspaces/cluster-ui/src/statementDetails/statementDetails.tsx
@@ -527,7 +527,9 @@ export class StatementDetails extends React.Component<
       (stats.nodes || []).map(node => node.toString()),
     ).sort();
     const regions = unique(
-      (stats.nodes || []).map(node => nodeRegions[node.toString()]),
+      (stats.nodes || [])
+        .map(node => nodeRegions[node.toString()])
+        .filter(r => r), // Remove undefined / unknown regions.
     ).sort();
 
     const lastExec =
diff --git a/pkg/ui/workspaces/cluster-ui/src/statementsTable/statementsTable.spec.tsx b/pkg/ui/workspaces/cluster-ui/src/statementsTable/statementsTable.spec.tsx
new file mode 100644
index 000000000000..3538dc847188
--- /dev/null
+++ b/pkg/ui/workspaces/cluster-ui/src/statementsTable/statementsTable.spec.tsx
@@ -0,0 +1,60 @@
+// Copyright 2022 The Cockroach Authors.
+//
+// Use of this software is governed by the Business Source License
+// included in the file licenses/BSL.txt.
+//
+// As of the Change Date specified in that file, in accordance with
+// the Business Source License, use of this software will be governed
+// by the Apache License, Version 2.0, included in the file
+// licenses/APL.txt.
+
+import { assert } from "chai";
+import Long from "long";
+import {
+  AggregateStatistics,
+  populateRegionNodeForStatements,
+} from "./statementsTable";
+
+describe("populateRegionNodeForStatements", () => {
+  function statementWithNodeIDs(...nodeIDs: number[]): AggregateStatistics {
+    return {
+      aggregatedFingerprintID: "",
+      aggregatedFingerprintHexID: "",
+      label: "",
+      summary: "",
+      aggregatedTs: 0,
+      aggregationInterval: 0,
+      implicitTxn: false,
+      fullScan: false,
+      database: "",
+      applicationName: "",
+      stats: { nodes: nodeIDs.map(id => Long.fromInt(id)) },
+    };
+  }
+
+  it("maps nodes to regions, sorted", () => {
+    const statement = statementWithNodeIDs(1, 2);
+    populateRegionNodeForStatements([statement], {
+      "1": "gcp-us-west1",
+      "2": "gcp-us-east1",
+    });
+    assert.deepEqual(["gcp-us-east1", "gcp-us-west1"], statement.regions);
+  });
+
+  it("handles statements without nodes", () => {
+    const statement = statementWithNodeIDs();
+    populateRegionNodeForStatements([statement], {
+      "1": "gcp-us-west1",
+      "2": "gcp-us-east1",
+    });
+    assert.deepEqual(statement.regions, []);
+  });
+
+  it("excludes nodes whose region we don't know", () => {
+    const statement = statementWithNodeIDs(1, 2);
+    populateRegionNodeForStatements([statement], {
+      "1": "gcp-us-west1",
+    });
+    assert.deepEqual(statement.regions, ["gcp-us-west1"]);
+  });
+});
diff --git a/pkg/ui/workspaces/cluster-ui/src/statementsTable/statementsTable.tsx b/pkg/ui/workspaces/cluster-ui/src/statementsTable/statementsTable.tsx
index c8f440c8b41d..b0b8b60472f0 100644
--- a/pkg/ui/workspaces/cluster-ui/src/statementsTable/statementsTable.tsx
+++ b/pkg/ui/workspaces/cluster-ui/src/statementsTable/statementsTable.tsx
@@ -341,10 +341,13 @@ export function populateRegionNodeForStatements(
     // E.g. {"gcp-us-east1" : [1,3,4]}
     if (stmt.stats.nodes) {
       stmt.stats.nodes.forEach(node => {
-        if (Object.keys(regions).includes(nodeRegions[node.toString()])) {
-          regions[nodeRegions[node.toString()]].add(longToInt(node));
-        } else {
-          regions[nodeRegions[node.toString()]] = new Set([longToInt(node)]);
+        const region = nodeRegions[node.toString()];
+        if (region) {
+          if (Object.keys(regions).includes(region)) {
+            regions[region].add(longToInt(node));
+          } else {
+            regions[region] = new Set([longToInt(node)]);
+          }
         }
       });
     }
diff --git a/pkg/ui/workspaces/cluster-ui/src/transactionsPage/transactionsPage.tsx b/pkg/ui/workspaces/cluster-ui/src/transactionsPage/transactionsPage.tsx
index 21df50dc6328..c59b79dbed4c 100644
--- a/pkg/ui/workspaces/cluster-ui/src/transactionsPage/transactionsPage.tsx
+++ b/pkg/ui/workspaces/cluster-ui/src/transactionsPage/transactionsPage.tsx
@@ -404,8 +404,6 @@ export class TransactionsPage extends React.Component<
     const statements = data?.statements || [];
     const { filters } = this.state;
 
-    // If the cluster is a tenant cluster we don't show info
-    // about nodes/regions.
     const nodes = Object.keys(nodeRegions)
       .map(n => Number(n))
       .sort();
diff --git a/pkg/ui/workspaces/cluster-ui/src/transactionsPage/utils.spec.ts b/pkg/ui/workspaces/cluster-ui/src/transactionsPage/utils.spec.ts
index 1c23ce961822..1056c9275dfd 100644
--- a/pkg/ui/workspaces/cluster-ui/src/transactionsPage/utils.spec.ts
+++ b/pkg/ui/workspaces/cluster-ui/src/transactionsPage/utils.spec.ts
@@ -11,6 +11,7 @@
 import { assert } from "chai";
 import {
   filterTransactions,
+  generateRegion,
   getStatementsByFingerprintId,
   statementFingerprintIdsToText,
 } from "./utils";
@@ -19,6 +20,8 @@ import { data, nodeRegions } from "./transactions.fixture";
 import Long from "long";
 import * as protos from "@cockroachlabs/crdb-protobuf-client";
 
+type Statement =
+  protos.cockroach.server.serverpb.StatementsResponse.ICollectedStatementStatistics;
 type Transaction =
   protos.cockroach.server.serverpb.StatementsResponse.IExtendedCollectedTransactionStatistics;
 
@@ -288,3 +291,47 @@ SELECT _`,
     );
   });
 });
+
+describe("generateRegion", () => {
+  function transactionWithStatementFingerprintIDs(
+    ...ids: number[]
+  ): Transaction {
+    return {
+      stats_data: {
+        statement_fingerprint_ids: ids.map(id => Long.fromInt(id)),
+      },
+    };
+  }
+
+  function statementWithFingerprintAndNodeIDs(
+    id: number,
+    ...nodeIDs: number[]
+  ): Statement {
+    return {
+      id: Long.fromInt(id),
+      stats: { nodes: nodeIDs.map(id => Long.fromInt(id)) },
+    };
+  }
+
+  it("gathers up the list of regions for the transaction, sorted", () => {
+    assert.deepEqual(
+      generateRegion(
+        transactionWithStatementFingerprintIDs(42),
+        [statementWithFingerprintAndNodeIDs(42, 1, 2)],
+        { "1": "gcp-us-west1", "2": "gcp-us-east1" },
+      ),
+      ["gcp-us-east1", "gcp-us-west1"],
+    );
+  });
+
+  it("skips over nodes with unknown regions", () => {
+    assert.deepEqual(
+      generateRegion(
+        transactionWithStatementFingerprintIDs(42),
+        [statementWithFingerprintAndNodeIDs(42, 1, 2)],
+        { "1": "gcp-us-west1" },
+      ),
+      ["gcp-us-west1"],
+    );
+  });
+});
diff --git a/pkg/ui/workspaces/cluster-ui/src/transactionsPage/utils.ts b/pkg/ui/workspaces/cluster-ui/src/transactionsPage/utils.ts
index 1bd1e5363485..382e7004389c 100644
--- a/pkg/ui/workspaces/cluster-ui/src/transactionsPage/utils.ts
+++ b/pkg/ui/workspaces/cluster-ui/src/transactionsPage/utils.ts
@@ -273,7 +273,9 @@ export const generateRegion = (
       });
   });
 
-  return Array.from(regions).sort();
+  return Array.from(regions)
+    .filter(r => r) // Remove undefined / unknown regions.
+    .sort();
 };
 
 /**