Tenedos
The Aegean Sea
In the bin near the tunnel entrance.
Near the entrance stairs, under it. But what will you do when the island is gone
Larvitar is found near the Canyon Entrance in Seven Island.
They are in one of the two trash cans near the Tour entrance (under the garbage).
Hilton Head Island takes its name from a headland near the entrance to Port Royal Sound.
Dardanelles
Go to Iron Island after you have defeated the Elite 4 and go in the house near the entrance and Byron gives to you.
Entrance Island - British Columbia - was created in 1875.
As Cinnibar Island has erupted, the gym moved to the Seafoam Islands to the east. It is in the island on the cinnibar side, inside up the stairs near the entrance/exit.
there is no secret entrance
It unlocks Mordred's secret laboratory. The entrance is between the two hay bales in the farm area near the mill.