It is reasonably plain that the Aguastos and the Chupunes occupied more or less the same territory--along the south shore of the eastern end of Carquinez Strait and the western end of Suisun Bay. The diaries and the baptism records both indicate that the original inhabitants were the Aguastos, who were missionized and removed. Their place seems to have been taken by another group of natives known as the Chupunes, who also were gathered into the fold at some period between the visits of Abella and Duran. Subsequent to the 1817 diary of Duran there is no further mention of this tribe. With respect to population we have only the record showing 105 baptisms. Since the conversion seems to have been quite complete, we may set the aboriginal value at no more than 150. Let us now consider the Ompines. This group is placed by Schenck on the north bank of the Sacramento River at and above the junction of the river and Suisun Bay. Schenck also (p. 137) discusses the possibility that the Ompines and Julpunes composed a single group. In spite of an assumed similarity in names the Spanish accounts are unequivocally explicit to the effect that there were two groups, not one, hence Schenck's hypothesis may be disregarded. With respect to location the later Spanish accounts bear out Schenck's contention that the tribe was situated north of the river. In his entry for May 14, 1817, Duran says that his expedition stopped at the mouth of the San Joaquin River, whereas another boat (that of Argüello) stopped opposite "en tierra de Ompines." The next day they all went up the Sacramento River to the "remate de las lomas de los Ompines." Meanwhile Argüello, in his entry for May 15, says that they went along the north shore and stopped "donde termina la tierra de los Ompines." This puts the eastern edge of the Ompines at the east side of the Montezuma Hills in T3N, R2E, approximately as shown by Schenck. Altimira describes an unauthorized raid by Fr. Duran on the tribes north of Suisun Bay, among them "... otra rancheria aislada llamada los Ompines" (Altimira, MS, 1823). A few of the earlier documents, on the other hand, contain statements which raise the possibility that the Ompines were not always confined exclusively to the north shore. In his diary of 1811 Abella describes how, on October 17, his party entered a big bay (Suisun Bay) and, after 5 leagues, following along the south shore, began to find estuaries and numerous islands covered with tules. They continued into the west channel of the San Joaquin and stopped at an island on which large trees were growing. At this point, somewhere near Antioch, there was a "pescadero" of the Ompines. It is evident, therefore, that in 1811 the Ompines had at least temporary fishing spots on the south side of the estuary, in an area usually ascribed to the Julpunes or Tarquines.