lookout post; observation point; monitoring station
A fixed location for watching or monitoring, such as a guard post, fire lookout, or surveillance station.
A lookout post was set up on the mountain.
They reported suspicious activity from the observation point.
見張り所 is a more general lookout or watch post, often for security or sentry duty, while 監視所 implies systematic monitoring or surveillance.
Compound of 監視 (kanshi, 'monitoring, surveillance') and 所 (sho, 'place, station').