Amazon DocumentDB (with MongoDB compatibility) is Now Available in the Asia Pacific (Mumbai) Region

Amazon DocumentDB is a fast, scalable, highly available, and fully managed document database service that supports MongoDB workloads.  

You can use Amazon DocumentDB in the following AWS regions: US East (N. Virginia, Ohio), US West (Oregon), Europe (Ireland, Frankfurt, London), and Asia Pacific (Mumbai, Sydney, Tokyo, Seoul). For more information on AWS regions and services, please visit the AWS global region table.