Outdoor Sunken Seating Area . The sunken spot features a seating section, a grilling area, and a large outdoor dining table. 25 creative sunken sitting areas for a mesmerizing backyard landscape. Pin by Zweigle on alta vista in 2020 Sunken patio, Backyard from www.pinterest.com.mx The alfresco space was designed to function as an outdoor lounge. Sunken seating area with built in seating and concrete fire pit. The idea of creating a sunken seating area for your outdoor living space seems like one that could seem like an enormous task to undergo.