Occurrence of Attributes in Original Text

The text related to the cultural heritage 'Serengeti National Park' has mentioned 'World' in the following places:
Occurrence Sentence Text Source
The Masai giraffe (Giraffa camelopardalis tippelskirchii) has the biggest giraffe study in the world ongoing.
It is also the world's longest overland migration.
In the vast plains of Serengeti National Park, comprising 1.5 million hectares of savannah, the annual migration of two million wildebeests plus hundreds of thousands of gazelles and zebras - followed by their predators in their annual migration in search of pasture and water xe2x80x93 is one of the most impressive nature spectacles in the world.
Criterion (vii): The Serengeti plains harbour the largest remaining unaltered animal migration in the world where over one million wildebeest plus hundreds of thousands of other ungulates engage in a 1,000 km long annual circular trek spanning the two adjacent countries of Kenya and Tanzania.
The combination of volcanic soils combined with the ecological impact of the migration results in one of the most productive ecosystems on earth, sustaining the largest number of ungulates and the highest concentration of large predators in the world.