| Masiwang River | |
| Name Other: | Sungai Masiwang, Wae Masiwang, Wae Marsimang |
| Map Size: | 285 |
| Pushpin Map: | Indonesia Seram#Indonesia Maluku#Indonesia |
| Pushpin Map Size: | 285 |
| Pushpin Map Caption: | Location of river mouth |
| Subdivision Type1: | Country |
| Subdivision Name1: | Indonesia |
| Subdivision Type2: | Province |
| Subdivision Name2: | Maluku |
| Subdivision Type3: | Regency |
| Source1 Location: | Seram Island |
| Mouth: | Banda Sea |
Masiwang River is a river of eastern Seram Island, Maluku province, Indonesia, about 2700 km northeast of the capital Jakarta.[1]
The Masiwang River flows through a wide valley, and is typically shallow, with a significant amount of sediment load.[2] The watershed area of Masiwang is the largest in the eastern part of Seram island with an area of 1189.338 km2.[3] It flows into the sea on the southeast coast of Seram, between Tanjung Tioli, the eastern point of Waru Bay, and Tanjung Masiwang, forming a delta.[4] The Masiwang and Seti languages are spoken in the vicinity.[5]
The river flows in the eastern area of Seram island with predominantly tropical rainforest climate (designated as Af in the Köppen-Geiger climate classification).[6] The annual average temperature in the area is 23 °C. The warmest month is March, when the average temperature is around 24 °C, and the coldest is July, at 21 °C.[7] The average annual rainfall is 2814 mm. The wettest month is July, with an average of 422 mm rainfall, and the driest is October, with 95 mm rainfall.[8]