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In the south, Mexico borders on Guatemala and Belize. These three countries are linked by natural continuums called river basins. There are six river basins on Mexico's southern border four of which are divided among Mexico and Guatemala (Suchiate, Coatan, Grijalva and Candelaria) while the remaining two (Usumacinta and Hondo) are shared by Mexico, Guatemala and Belize. This paper presents the delimitation of the six transboundary river basins and the problematic issues that explain the lack of transboundary water policies in these territories, which are now essential. [ABSTRACT FROM AUTHOR]

This article examines perceptions of river and stream water quality in the Fogórico micro watershed, from the perspective of water users and representatives of political and institutional groups. The area is in the hydrographic network of the San Cristobal watershed, in the XI Frontera Sur hydrological and administrative region and in the south-southeastern hydrological meso-region. It is located in north-central Chiapas, in a socioeconomic region known as the Altos de Chiapas. The research revealed that perceptions are heterogeneous in most cases, both between groups and within them. It also revealed the different aspects of the problematic in terms of the problems and solutions, with a prevalence of a critical attitude toward the actions of Others, Added to that, the research identified aspects that influence perceptions, such as the worldview and the location of the micro watershed. [ABSTRACT FROM AUTHOR]