How much sea is around the island where Kerinci Mountain is located?
SELECT COUNT(T4.Sea) FROM mountain AS T1 INNER JOIN mountainOnIsland AS T2 ON T1.Name = T2.Mountain INNER JOIN island AS T3 ON T3.Name = T2.Island INNER JOIN islandIn AS T4 ON T4.Island = T3.Name WHERE T1.Name = 'Kerinci'