The greatest rainfall on the N coast of Ujung Masam Muka and the off-lying islands usually occurs in the months of October and November, the months preceding the change to the Northeast Monsoon.

The period of the greater or less rainfall on the N half of the island does not correspond with the periods of the monsoons. Rain occurs throughout the year in Sumatera. The Southwest Monsoon is the best for landing on this portion of Sumatera. At times the monsoon blows strongly for some days, at which times communication with the shore is impracticable.ĭecember and January are considered to be the worst months. Both subside quickly, so that the water is generally smooth at night. Winds-Weather.-At the N and NE portion of Sumatera, during the Northeast Monsoon, there is generally a swell on the coast, which gives rise to a considerable sea in the afternoon if accompanied by a stiff sea breeze. North Sumatra has international seaport at Belawan, Medan and now to prepare a new seaport at Kuala Tanjung. Several large islands in the Indian Ocean off the coast of Sumatra are part of North Sumatra, most notably Nias, and the Batu Islands. The length of Sumatra the mountains here are dominated by Lake Toba, formed from the caldera of an ancient volcano. In the south and west, the land rises to the mountain range that runs The province contains a broad, low plain along the Strait of Malacca on which the provincial capital, Medan, is located. It borders Aceh province on the northwest. North Sumatra stretches across the island between the Indian ocean and the Strait of Malacca.

North sumatra