"Treasure Island" is a real surf spot, but it's not where you think it is
I'm not the first to name this spot or put up a map, that was this guy or the World Stormrider Guide Volume 2. The spot is also known as Machine Gun Rights. Several boat operators refuse to name the spot, all the while treating it as the focus of their Northern Sumatra boat trips.
However, once I went there I realized the spot is NOT where the online map or the map in World Stormrider Guide Vol. 2 say it is. Those maps are an inside joke that do exactly what this blog post is trying to do - reveal that there is great surf in this general area, and if you actually make it to indo and ask around or book with the right operator, you'll probably be able to score it. Any of the boat operators I list as "dedicated" to Northern Sumatra on this post can dial you in to a session.
There are important downsides to this spot however:
1) Treasure Island needs a fair amount of swell from a specific direction - not every swell angle will get in.
2) It's not a swell magnet - it needs to be decent sized to get going.
3) The area is extremely isolated. Forget about flying in, and it will take a long time to get there by bus/ferry. The area is lightly populated with poor land access to the break. You won't easily be able to buy shelter, food, or transport from locals anywhere near the surf spot. There are definitely no local surfers, nor are there really any local villagers. The extreme isolation means that boats accessing this spot have limited time to wait around for the right swell/wind combo to make it happen. It's at least a few days motor from Padang, meaning if you book a 10 day trip out of Padang and opt to head north you'll surf the Telos on Day 1, Nias on day 2 or 3, and up north by day 4 or 5. Your trip is half gone and you're just getting there. The "Sjalina" operating out of Simeulue, "Mikumba" or "KM Nauli" out of Nias or Sibolga, and "Bohemian" out of Sibolga probably have the closest access and could conceivably surf there on the first & last day of their trip. But remember - for those sensitive to time off work, just getting to Nias or Sibolga takes an extra travel day coming in and going home.