A waterside swallow with a metallic blue back and white rump. It occurs around mangroves, rivers, and coastal waters.
Adults are metallic blue above, with a white belly and rump and a white chevron at the bill base. Juveniles are gray-brown below but also have a white rump.
It uses lowland waters, including mangroves, coastal lagoons, and inland rivers. It may form small groups with other swallows.
An extinction-risk assessment has not been added yet.