Belon'i Tsiribihina (also referred to as Belo sur Tsiribihina) is a district of the Menabe region of Madagascar and borders the Miandrivazo region to the east, the Mahabo to the southeast, and the Morondava to the southwest. The district has an area of , and the estimated population in 2020 was 138,775.
The district is further divided into 14 communes:
The Bedo lake, Kiboy Lake and the Kimanaomby Lake.
The district is crossed by the unpaved National road 8 from south to north.