Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Maps were created by authors using United States Geological Survey Earth Explorer Landsat images (https://earthexplorer.usgs.gov/) and Sri Lanka Survey department hard copy maps of DSD and Sri Lankan boundary.
