HomeUPSCThe north flowing rivers of Siberia are not of much use tor navigation mainly because 787. The north flowing rivers of Siberia are not of much use tor navigation mainly becauseBy Admin / October 4, 2025 A. they are too shallow in the dry season B. the lower courses remain frozen for many months C. they flow through uninhabited areas D. they lack navigation facilities to ensure safety ✅ The correct answer is option B.