Logging in the Ulu Muda Forest Reserve would put at risk the water supply for some 4.2 million people, a youth environmental initiative told the Kedah state government.

MyHutan said this will affect users in Perlis, Kedah, and Penang.

"About 70 percent of Perlis' and 96 percent of Kedah's raw water comes from Ulu Muda," it said, adding that more than 80 percent of...