Map and perspective view by Barrelier de Bitry (1718), 51.5 cm × 53.5 cm at a scale of 9.4 cm per 100 “toises” (ca. 1: 2100; 1 toise ≈ 1.95 m), with topographic profile (left) from the River Garonne (I) to Loubens (E); details of the cliff at Sainte-Croix-du-Mont (bottom left) and Loubens (bottom right) are shown (©Bibliothèque de l’Institut; see Appendix A3.5). The cliff is represented from the castle (A) to its SE edge (H), with a mottled pattern indicating the oyster-rich level (e.g., between C and D). The letters refer to a missing memoir; A: castle; B: church; C: ravine (?); D, E, F: Loubens; "O": troglodyte chapel; K: access to “allée des pins", where Louis XIII landed in 1620.