The site of Otafunbe Chashi (オタフンベチャシ跡, Otafunbe chashi ato) in Urahoro, Hokkaidō, Japan, is that once occupied by the Ainu fortified chashi of Otafunbe. It has been designated a national Historic Site. The name combines the Ainu for "sand" (ota) with that for "whale" (funbe or humbe). At the edge of the Shiranuka Hills (白糠丘陵), the low elevation, rising to some 27 metres (89 ft), is now separated from the Pacific coast by Hokkaido Route 1038 (ja). The mound is topped by a flattish area of some 21 metres (69 ft) by 7 metres (23 ft), surrounded by a ditch.