Sekayam River is a river of Borneo

Borneo

Borneo is the third largest island in the world and is located north of Java Island, Indonesia, at the geographic centre of Maritime Southeast Asia....

, Indonesia

Indonesia

Indonesia , officially the Republic of Indonesia , is a country in Southeast Asia and Oceania. Indonesia is an archipelago comprising approximately 13,000 islands. It has 33 provinces with over 238 million people, and is the world's fourth most populous country. Indonesia is a republic, with an...

.It is a tributary of the Kapuas River

Kapuas River

The Kapuas River is a river in the Indonesian part of Borneo island, at the geographic center of Maritime Southeast Asia. At in length, it is the longest river of Indonesia and one of the world's longest island rivers...

. The Program Pemberdayaan Sistem Hutan Kerakyatan (PPSHK) has a scheme on the river aimed at reducing the level of mercury content absorbed by humans.

The river flows through the dense rainforest of Borneo. The Entabai River enters the Sekayam River. During the 1880s the river was exploited for its Cinnabar

Cinnabar

Cinnabar or cinnabarite , is the common ore of mercury.-Word origin:The name comes from κινναβαρι , a Greek word most likely applied by Theophrastus to several distinct substances...

 and antimony

Antimony

Antimony is a toxic chemical element with the symbol Sb and an atomic number of 51. A lustrous grey metalloid, it is found in nature mainly as the sulfide mineral stibnite...

in its far upper course.