[8] El Tintal is located in the north of the department of Petén, in a remote area still covered by dense virgin rainforest and only accessible by mule trails.[10] El Tintal was first visited by Heinrich Berlin in the 1950s but it was not until 1970 that test pits were excavated by archaeologists Ian Graham and Joyce Marcus, of the universities of Harvard and Michigan respectively.[12] The Mirador Basin Project mapped 9 square kilometres (3.5 sq mi) around the monumental architecture of El Tintal, recording 850 major structures reaching up to 50 metres (160 ft) high.[20] The Mano de León Complex is the most heavily looted area of the city, with 945 looters' trenches mapped by the Mirador Basin Project.An important find in a heavily looted area to the southwest of the complex was that of a painted ceramic vessel in a modified Codex style and dating to around AD 700–750, in the Late Classic.It bears depictions of the Maya Maize God and painted hieroglyphs stating that it was a drinking vessel belonging to Yopaat B'ahlam, an important lord who is named in a variety of texts from Late Classic sites in the Mirador Basin.[21] The preserved designs on the butt include hundreds of carved lines and symbols forming graffiti in a style typical of Preclassic imagery in the region.