Gapun is a village in Marienberg Rural LLG, East Sepik Province, Papua New Guinea, located near the mouth of the Sepik River. The language isolate Tayap is traditionally spoken in Gapun by the Tayap people. Gapun village is the sole Tayap settlement, while all other neighboring villages are inhabited by non-related ethnic groups. The sociolinguistic history of the village has been presented in textbooks as a case study on how and why language shift and language death occur. The village is called Saŋgap in the Kopar language.