DOC-1335 AWS transit gateway (#316)

* DOC-1335 AWS transit gateway

* typo

* incorporate review feedback

* style edits

Author: micheleRP

modules/ROOT/nav.adoc

@@ -31,6 +31,7 @@
 **** xref:networking:byoc/aws/vpc-peering-aws.adoc[Add a Peering Connection]
 **** xref:networking:configure-privatelink-in-cloud-ui.adoc[Configure PrivateLink in the Cloud UI]
 **** xref:networking:aws-privatelink.adoc[Configure PrivateLink with the Cloud API]
+**** xref:networking:byoc/aws/transit-gateway.adoc[Add a Transit Gateway]
 *** xref:networking:byoc/azure/index.adoc[Azure]
 **** xref:networking:azure-private-link.adoc[]
 *** xref:networking:byoc/gcp/index.adoc[GCP]

modules/get-started/pages/whats-new-cloud.adoc

@@ -9,6 +9,10 @@ This page lists new features added to Redpanda Cloud.
 
 == June 2025
 
+=== Amazon VPC Transit Gateway
+
+For BYOC and BYOVPC clusters on AWS, you can set up an xref:networking:byoc/aws/transit-gateway.adoc[Amazon VPC Transit Gateway] to connect VPCs to Redpanda services while maintaining control over network traffic. 
+
 === Support for additional regions
 
 Serverless clusters now support the following new xref:reference:tiers/serverless-regions.adoc[regions on AWS]: ap-northeast-1 (Tokyo), ap-southeast-1 (Singapore), and eu-west-2 (London).

modules/networking/pages/byoc/aws/transit-gateway.adoc

@@ -0,0 +1,22 @@
+= Add Amazon VPC Transit Gateway
+:description: Use a transit gateway to connect your BYOC cluster to AWS VPCs or on-premises networks.
+
+You can set up an https://docs.aws.amazon.com/vpc/latest/tgw/what-is-transit-gateway.html[Amazon VPC Transit Gateway^] to connect your internal VPCs to Redpanda services while maintaining full control over network traffic. The transit gateway acts as a central hub for routing traffic between VPCs, enabling communication between a Redpanda cluster and client applications hosted in different VPCs that can be in different AWS accounts.
+
+AWS Transit Gateway is available for BYOC and BYOVPC clusters.  
+
+== Set up Amazon VPC Transit Gateway
+
+To set up Amazon VPC Transit Gateway for Redpanda:
+
+. Create a transit gateway in your AWS account.
+. Create transit gateway attachments to the VPC hosting Redpanda and the VPC that will communicate to Redpanda (where the producer or consumer resides).
+. Update the transit gateway route table with the new routes for transit gateway attachments.
+
+For detailed instructions, see the https://docs.aws.amazon.com/vpc/latest/tgw/tgw-transit-gateways.html[AWS Transit Gateways documentation^].
+
+== Example
+
+The https://github.com/redpanda-data/cloud-examples/blob/9e2083e4bd8392e288ab6991b2a5a9b77a5fb0c5/aws-transit-gateway/README.md[Redpanda Cloud Examples repository^] provides sample Terraform code to set up and manage an Amazon VPC Transit Gateway for accessing Redpanda services across multiple VPCs. It includes steps for when the Redpanda cluster and client applications are hosted in the same AWS account and in different AWS accounts.
+
+NOTE: Your implementation may differ depending on the networking configuration within your VPCs.