A lightweight, compact foldable beach chair is presented. The present invention beach chair features an upper seatback portion and a lower sand engagement portion. The seatback portion forms the backrest of the chair and the sand engagement portion anchors the chair in sand. The beach sand itself serves as the seat support for a user. The seatback and sand engagement portions are interconnected by a hub such that the seatback portion and sand engagement portion can rotate about the hub from an open, ready for use position, to a closed position for carrying. The new beach chair includes a detent system such that the seatback and sand engagement portions lock together when in the open and closed positions.