on the west bank of the River Tiber, south of Vatican City, in the plain between the meander of the river and the Janiculum Hill. In addition to the river, that marks the eastern border of the borough, the area is delimited to the west and to the south by the Janiculum walls, and to the north by the Galleria Principe Amedeo di Savoia-Aosta tunnel. Boundaries To the north, Trastevere borders with Borgo (R. XIV), whose border is defined by a portion of the walls of Urban VIII, beside Rampa del Sangallo and Viale delle Mura Aurelie, by Piazza della Rovere and by Ponte Principe Amedeo. To the east, the rione borders with Ponte (R. V), Regola (R. VII) and Ripa (R. XII): the border is marked by the stretch of the Tiber between Ponte Principe Amedeo and Ponte Sublicio. To the south, Trastevere borders with Quartiere Portuense (Q. XI), from which is separated by a short stretch of the Aurelian Walls beside Piazza di Porta Portese; as well as with Quartiere Aurelio (Q. XIII), from which is separated by the stretch of the Walls between Porta Portese and Porta San Pancrazio. Westward, it borders with Quartiere Gianicolense (Q. XII), whose boundary is marked by the Aurelian Walls, alongside Viale delle Mura Aurelie. Places of interest Palaces and other buildings Palazzo Corsini alla Lungara, in Via della Lungara, seat of the botanical garden of Rome. Villa Farnesina, in Via della Lungara. Palazzo San Callisto, fronting Piazza Santa Maria in Trastevere and Piazza di San Calisto. Vatican extraterritorial building. Houses some departments of the Roman Curia. Villa Lante al Gianicolo, in Passeggiata del Gianicolo. Villa Sciarra, in Via Calandrelli. Villa Spada, in Via Giacomo Medici, built in 1639, seat of the Irish embassy to the Holy See. Regina Coeli, in Via della Lungara. San Michele a Ripa. Churches Basilica di Santa Maria in Trastevere Santa Maria dell'Orto San Crisogono Santa Cecilia in Trastevere Santa Maria dei Sette Dolori San Pietro in Montorio San Callisto Sant'Agata in Trastevere Sant'Onofrio al Gianicolo San Benedetto in Piscinula Santa Maria della Luce Santi Maria e Gallicano Sante Rufina e Seconda Santa Margherita in Trastevere Chiesa di San Cosimato Santi Quaranta Martiri e San Pasquale Baylon San Francesco a Ripa San Giovanni Battista dei Genovesi Santa Maria in Cappella Sant'Egidio Santa Maria della Scala Santa Dorotea San Giovanni della Malva in Trastevere Santa Croce alla Lungara