GONG - The Javanese term for a large, suspended metal percussion instrument with a raised section in the center (the boss), often called gong ageng in Java and Bali.

A text summary of the clickable map above, meant for web-crawlers and other automatic tools:
gong has type talempong
gong raised center section boss
gong found in Bali
gong found in Java
gong found in Sunda
gong is example of Indonesian instrument(s)