Mountainous terrain covers much of Vietnam, extending from the northern regions through the Truong Son Range to the Central Highlands. These areas are typically characterized by highly dissected terrain, steep slopes, difficult access, variable weather conditions and potential risks of landslides, rockfalls and erosion.

A dense river network, together with numerous natural lakes and reservoirs, creates areas with variable riverbed and lakebed topography, complex flow patterns and seasonal water level fluctuations. Many projects require coordinated surveys on land, at the water surface and underwater across different months of the year.

These areas feature stepped and undulating terrain with varying slopes, forming a transition between plains and mountainous regions. Ground conditions often exhibit uneven weathering, faulting and rapid variations over short distances. The risk of slope instability places greater demands on engineering geological investigations.

The Red River Delta and the Mekong Delta are low-lying and relatively flat, but ground conditions are often complex. Layers of mud, soft clay or recent sediments have low bearing capacity, high settlement potential and variable thickness, alongside high groundwater levels and saline inundation.

Major cities have dense concentrations of buildings, traffic, utility infrastructure and underground structures. Surveying or construction must be carried out in confined spaces, close to existing structures, and sometimes within facilities that remain in operation.

Vietnam has a long coastline with numerous estuaries, lagoons and tidal flats. The terrain continually changes under the influence of waves, wind, tides, currents and sedimentation–erosion processes. Coastal ground is often soft and weak, with chemically aggressive conditions, while construction activities depend heavily on the weather.

Projects on islands and routes connecting the mainland to islands pose specific requirements for transportation, logistics, positioning, seabed surveys, marine geological investigations and construction planning in rough seas and strong winds.

PSC’s linear infrastructure projects can extend over hundreds of kilometres, crossing multiple provinces and continuously transitioning between plains, rivers and lakes, wetlands, residential areas, forests and high mountains. Implementation requires the simultaneous deployment of multiple survey teams, consistent coordinate and elevation reference systems, and control of data consistency across the sections within its assigned scope.

The narrow coastal strip of central Vietnam features mountains close to the sea, interspersed with river mouths, lagoons and sandy beaches, and is frequently affected by storms, floods, storm surges and erosion. Geological conditions vary rapidly, from exposed bedrock and heavily weathered rock in mountainous areas to sand and marine sediments along the coast.

The terrain transitions from plains and midlands to high mountains, interspersed with extensive river and lake systems and deeply dissected landscapes. Geological conditions are diverse, ranging from lowland sediments to mountainous bedrock, with extensive weathering and complex geological structures in many areas.

The terrain is low-lying and relatively flat, with a dense network of rivers and canals. Geological conditions are dominated by young sediments and soft soils, forming thick deposits in delta regions and influenced by groundwater and tides.

Drawing on experience gained from thousands of projects across complex terrain and geological conditions in Vietnam, PSC is confident in its capabilities, expertise and adaptability to undertake projects overseas.