This chapter examines the effect of two contrasting aspects, North and South, and three slope positions (Hill Base, Mid Slope, and Hill Top) on each aspect on vegetation parameters, tree and soil water potential, and net assimilation rate (NAR) in a series of Central Himalayan forests, namely sal (Shorea robusta) forest, sal-chir pine (Pinus roxburghii) forest, chir pine forest, banj oak (Quercus leucotrichophora) forest, tilonj oak (Q. floribunda) forest, and kharsu oak (Q. semecarpifolia) forest. Water potential (Ψ) and NAR were measured in all seasons, namely winter, pre-monsoon, monsoon, spring, and autumn. The mesic northern slopes and hill bases generally supported higher species richness, diversity, tree density, and basal area compared to southern slopes and hill tops. ΨPD and Ψsoil were generally higher on moist north slope aspect (−0.78 ± 0.05 MPa and −3.34 ± 0.18 MPa, respectively) than dry south slope aspect (−0.82 ± 0.18 MPa and −3.77 ± 0.18 MPa, respectively). Across six different forests, these values were higher at hill base (−0.71 ± 0.06 MPa and −2.77 ± 0.19 MPa, tree predawn water potential and soil water potential, respectively) than other topographical positions. Net assimilation rates (μ mol m−2 s−1) followed similar patterns; the average across the four forest sites and five seasons was higher on the north (5.08 ± 0.23) slope aspect than south aspect (4.61 ± 0.22), and among the three slope positions, it was higher on hill base (5.13 ± 0.29) than on mid-slope (4.80 ± 0.27) and hill top (4.61 ± 0.26). The novelty of this research lies in its comprehensive analysis of how topographical factors shape forest composition and functioning across an elevational gradient in the Central Himalayas. By demonstrating the importance of northern slopes and hill bases as potential refugia for species under climate change, this study provides valuable insights for forest conservation and management strategies in the region.