The Coco de Mer, also known as the "double coconut" or "sea coconut," is a rare and unique nut seed native to the Seychelles, a group of islands in the Indian Ocean off the eastern coast of Africa. The scientific name of this palm tree is Lodoicea maldivica. 

Appearance: The Coco de Mer is renowned for its enormous size and distinct appearance. The seed can weigh up to 15 kilograms (33 pounds) and can be as large as 40-50 centimeters (15-20 inches) in diameter, making it the largest seed in the plant kingdom. 

Shape: The Coco de Mer has a fascinating shape that resembles a female pelvis or buttocks. The smaller end of the seed is pointed, while the larger end is more rounded. 

Endemic to Seychelles: The Coco de Mer palm is native to only two islands in the Seychelles: Praslin and Curieuse. These islands are part of the UNESCO World Heritage site, Vallée de Mai Nature Reserve, which is dedicated to protecting this unique species. 

Reproductive Characteristics: The Coco de Mer tree has separate male and female trees. The female trees produce the famous double coconut seeds, while the male trees produce elongated catkin-like structures that release pollen. The wind carries the pollen to female trees for fertilization. 

Conservation Status: Due to its rarity and unique characteristics, the Coco de Mer is considered vulnerable and is protected by law in Seychelles. Harvesting and exporting the nuts are strictly regulated to preserve the species. 

Cultural Significance: The Coco de Mer has cultural significance in the Seychelles and is considered a national treasure. It features prominently in local folklore, art, and crafts, and its image is used on the country's passport and official seal. 

Tourist Attraction: The Coco de Mer is a major tourist attraction in Seychelles, drawing visitors from around the world to see this unusual and impressive nut seed. 

Given its scarcity and protected status, the Coco de Mer is not commonly found outside of its natural habitat in Seychelles. If you ever get the chance to visit Seychelles, you might be able to see the Coco de Mer nut seed in person at the Vallée de Mai Nature Reserve or through local crafts and souvenirs featuring its iconic shape.