Land reclamation involves:

Land reclamation primarily involves creating new land from bodies of water, such as oceans, rivers, or lakes. This process typically includes filling in water areas with materials like soil, sand, or debris to raise the land above water levels, allowing for new developments. It is a practice often used in urban planning and development to expand land availability for housing, industrial projects, or recreational purposes, especially in densely populated regions or where land is limited.

The other options present concepts that don't align with the definition of land reclamation. For instance, natural erosion processes on shorelines pertain to the gradual wearing away of land by natural forces, rather than creating new land. Restoring ecosystems refers to the process of returning damaged environments to their original state, which is different from the artificial creation of land. Lastly, converting agricultural land to urban areas involves changing the use of existing land rather than creating new land from water. Therefore, the accurate description of land reclamation is indeed the creation of new land from water bodies.