Rione XX Testaccio on Tavola 20, a street grid beside the Tiber with the slaughterhouse at left, Monte Testaccio in the middle and the Pyramid below.
Source: Old map, public domain
The Mattatoio fills the left side with red-outlined sheds, and the green mound of Monte Testaccio stands at the heart of the plate. Along the southern edge the Protestant cemetery and the British military cemetery lead to the Piramide beside Porta San Paolo.