Merunjau is a settlement in Betong, Sarawak, Malaysia. It lies approximately 147.1 kilometres (91.4 mi) east of the state capital Kuching. Neighbouring settlements include:

• Sengkalat 0 kilometres (0.0 mi) north
• Sanggau 1.9 kilometres (1.2 mi) north
• Ajong 2.6 kilometres (1.6 mi) southwest
• Nanga Kron 2.6 kilometres (1.6 mi) southwest
• Nanga Tapih 3.7 kilometres (2.3 mi) north