Rural water accessibility remains a major development challenge in Nigeria despite the country's abundant groundwater resources. Among the numerous factors influencing water accessibility, topographic barriers have received comparatively limited scholarly attention, even though they significantly affect groundwater occurrence, borehole development, water infrastructure, and socio-economic well-being. This review critically examines the effects of topographic barriers on rural water accessibility in Nigeria by synthesizing evidence from peer-reviewed journal articles, government publications, and reports from international organizations published between 2015 and 2026. A systematic narrative review approach was adopted, drawing data from reputable academic databases and institutional sources. The reviewed literature indicates that elevation, slope, rugged terrain, lateritic overburden, and geological formations constitute major topographic barriers influencing groundwater recharge, aquifer occurrence, borehole drilling depth, infrastructure development, and long-term water supply sustainability. These environmental constraints increase the technical complexity and financial costs of groundwater development while reducing equitable access to safe drinking water in many rural communities. The review further reveals that inadequate water accessibility contributes to reduced agricultural productivity, increased household expenditure on water, poor public health outcomes, lower educational participation, gender inequalities, and persistent rural poverty. Emerging evidence demonstrates that the integration of Geographic Information Systems (GIS), Remote Sensing, Digital Elevation Models (DEMs), hydrogeophysical investigations, and Integrated Water Resources Management (IWRM) principles can significantly improve groundwater exploration, borehole siting, and rural water planning. The review concludes that overcoming topographic constraints requires integrated policy interventions involving hydrogeological assessment, geospatial technologies, climate-resilient infrastructure, institutional collaboration, and active community participation. These measures are essential for improving rural water accessibility, reducing spatial inequalities, and accelerating progress toward achieving Sustainable Water Development.
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