Early Hawaiians applied the name Haleakalā ("house of the sun") to the general mountain. Haleakalā is also the name of a peak on the south western edge of Kaupō Gap. In Hawaiian folklore, the depression at the summit of Haleakalā was home to the grandmother of the demigod Māui. According to the legend, Māui's grandmother helped him capture the sun and force it to slow its journey across the sky in order to lengthen the day. The tallest peak of Haleakalā, at 10,023 feetis Puʻu ʻUlaʻula (Red Hill).From the summit one looks down into a massive depression some(7 mi) across,(2 mi) wide, and nearly(2,600 ft) deep. The surrounding walls are steep and the interior mostly barren-looking with a scattering of volcanic cones. The last eruption was in the 17th century.