The mountain range that bounds the Veld in the east is the Drakensberg Mountains. Let's explore this answer in detail:

The Drakensberg Mountains:
- The Drakensberg Mountains, also known as the Dragon Mountains, are a massive mountain range located in South Africa and Lesotho.
- The name "Drakensberg" is derived from the Afrikaans term meaning "Dragon Mountains," which refers to the jagged peaks resembling the spines of a dragon.
- These mountains stretch approximately 1,000 kilometers across the eastern side of South Africa, forming a natural border between Lesotho and the provinces of KwaZulu-Natal, Free State, and Eastern Cape.
- The range is part of the Great Escarpment, which is a geological formation that runs parallel to the southeastern coast of Africa.
- The Drakensberg Mountains are known for their dramatic landscapes, including steep cliffs, deep valleys, waterfalls, and grassy plateaus.
- The highest peak in the Drakensberg Mountains is Thabana Ntlenyana, reaching an elevation of 3,482 meters (11,423 feet) above sea level.

The Veld:
- The Veld, also spelled Veldt, is a term used to describe the wide, open grassy plains found in South Africa, Zimbabwe, and other southern African countries.
- The Veld is characterized by its flat to gently undulating terrain, with scattered trees, shrubs, and grasses covering the landscape.
- It is an important ecosystem, supporting a variety of wildlife such as antelopes, zebras, giraffes, and many bird species.
- The Veld is also used for agriculture, particularly for livestock grazing and the cultivation of crops like maize and wheat.

The Relationship:
- The Drakensberg Mountains form the eastern boundary of the Veld.
- This mountain range acts as a natural barrier, separating the high plateau of the Veld from the coastal regions of South Africa.
- The mountains influence the climate of the Veld, causing variations in temperature, rainfall, and vegetation patterns.
- The eastern slopes of the Drakensberg receive more rainfall, leading to lush vegetation, while the western side experiences a drier climate.
- The mountains also contribute to the formation of rivers and waterfalls, which are vital for the irrigation of the Veld and the surrounding areas.

In conclusion, the Drakensberg Mountains serve as the eastern boundary of the Veld, providing a stunning backdrop to the vast grassy plains and influencing the climate and ecology of the region.