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The savannas of the Kenya-Tanzania borderland cover >100,000 km2 and is one of the most important regions globally for biodiversity conservation, particularly large mammals. The region also supports >XX predominantly pastoralists and their livestock. In these systems, resources for both large mammals and pastoralists (i.e. green grass) are highly variable in space and time and thus require connected landscapes. However, ongoing fragmentation of (semi-)natural vegetation by smallholder fencing and expansion of mechanised agriculture threatens this social-ecological system. Spatial data on fences and agricultural expansion are localised and dispersed among data owners and databases. Here, we synthesised data from several research groups and conservation NGOs and present the Landscape Dynamics spatial-temporal database. The data includes 31,000 livestock enclosures, nearly 40,000 kilometres of fencing, and 1,500 km2 of agricultural land. We provide caveats and interpretation of the different methodologies used. These data are useful to answer fundamental ecological questions; to quantify the rate of change of ecosystem function and wildlife populations, for conservation and livestock management; and for local and governmental spatial planning.