Kbal Spean is an ancient Angkor ruin that is a 90-minute bumpy ride from Siem Reap, on the same route to Banteay Srei.
The tarred road ends at Banteay Srei, after which the roads become either very muddy or very dusty, depending on the time of the year. Upon your arrival at the foothills, get ready for another 45 minutes of moderately easy uphill climb. All this for the sake of viewing the carvings of lingas on the riverbed of the Siem Reap River, making it a "river of 1000 lingas". The belief is that the lingas "fertilize" the water that feed the East Baray and irrigates the rice fields.