Umbagog straddles New Hampshire and Maine with most of the lake and the main campground in New Hampshire. Our campsite was on the New Hampshire side. It involved a 3+ mile paddle from the put in on the Androscoggin River.
The site itself is very open with a beautiful view of the lake looking east. From the campsite the view involves not only the lake but surrounding mountains. Both the sunrise and moonrise are directly across the lake� both were spectacular!
The only down side of staying at a remote site is that there is no outhouse to speak of. The state does provide a "thunder box" which sits in the open except for a short wall on two sides. We lucked out and avoided rain so it wasn't a problem.
One thing to be aware of is how treacherous this shallow lake can be in windy conditions�beware! The site we stayed at is called Molls Rock and is called that for a good reason, it's on a large outcropping of granite and can be a little breezy for a good campfire sometimes.
In our exploration of the lake we decided to cross to the west side paddling 3 kayaks. Once we made to mile trip the wind came up and kicked up some pretty big waves�3 feet or so. We stuck to the shore and were attempting to follow it around the north end but is was obviously not safe. Luckily there was a state worker installing some solar panels in a small cove. He called his dispatch who contacted the campground and they came to the rescue in what looked like a modified fishing boat with a drop down ramp in the front.
After loading us and the boats they dropped us on the "rock" and wished us well. Any embarrassment I may have felt soon gave way to gratitude. We were safe, warm and dry. They assured us we weren't the first.
The main campground has hot showers, water, a small store and firewood available. There are also drive in campsites as well as a few cabins.