Arenal Botanical Gardens are botanical gardens located on the shore of Lake Arenal in north-west Costa Rica. They are located on the east side of the lake approximately 2 kilometers north of the village of Unión, Guanacaste. Opened in 1991, the garden displays hundreds of tropical plant species and colorful flower varieties. There is also a notable butterfly garden and hummingbird sanctuary. In recent years, the gardens have fallen into disrepair, and they are now in poor condition.