diff --git a/_data/chains/eip155-550.json b/_data/chains/eip155-550.json
new file mode 100644
index 000000000000..05ffc4467323
--- /dev/null
+++ b/_data/chains/eip155-550.json
@@ -0,0 +1,39 @@
+{
+  "name": "River",
+  "chain": "river",
+  "rpc": [
+    "https://mainnet.rpc.river.build",
+    "https://towns-mainnet.calderachain.xyz/http"
+  ],
+  "faucets": [],
+  "nativeCurrency": {
+    "name": "Ether",
+    "symbol": "ETH",
+    "decimals": 18
+  },
+  "features": [
+    {
+      "name": "EIP155"
+    },
+    {
+      "name": "EIP1559"
+    }
+  ],
+  "infoURL": "https://towns-mainnet.hub.caldera.xyz",
+  "shortName": "towns-mainnet",
+  "chainId": 550,
+  "networkId": 550,
+  "icon": "river",
+  "explorers": [
+    {
+      "name": "River Explorer",
+      "url": "https://explorer.river.build",
+      "standard": "EIP3091"
+    },
+    {
+      "name": "River Caldera Explorer",
+      "url": "https://towns-mainnet.calderaexplorer.xyz",
+      "standard": "EIP3091"
+    }
+  ]
+}
diff --git a/_data/icons/river.json b/_data/icons/river.json
new file mode 100644
index 000000000000..7395403cdffd
--- /dev/null
+++ b/_data/icons/river.json
@@ -0,0 +1,8 @@
+[
+  {
+    "url": "ipfs://bafkreiafftbrpywlc4awvbgbdau4bpd5rg27za4eyh7somqw5pv755gbmq",
+    "width": 28,
+    "height": 24,
+    "format": "svg"
+  }
+]