Lake Nyos is a crater lake in the Northwest Region of Cameroon, located about 315 km northwest of Yaoundé. Nyos is a deep lake high on the flank of an inactive volcano in the Oku volcanic plain along the Cameroon line of volcanic activity. A volcanic dam impounds the lake waters.

Can we draw the following conclusion?
Lake Nyos is connected to the ocean

OPT:
[1]. Yes
[2]. It's impossible to say
[3]. No
[3].