Tinnudir is where the Rangers now base all of their operations from within Evendim.
'You have done much to aid us here, and for that, I am grateful. But this colossus and Barad Tharsír are but minor points within Evendim. Annúminas to the west and the estates to the north hold more value than the ruins here.
'Follow the road north, then head west at the cross-roads until you reach Tinnudir. There, speak to Orchalwë to learn more.'
Orchalwë is at Tinnudir, north and west of the colossus.
After thanking you for aiding them, the Rangers at the colossus directed you to the island of Tinnudir.