English writers and translators often confuse when and how to use a definite article. We have several tips for translators on our knowledge base and

We precede any country with “the” whose name is plural or includes state, union, republic, and kingdom.

Incorrect:   The Dutch famine of 1944–45 is known in Netherlands as the Hongerwinter (literal translation: hunger winter).

Correct:       The Dutch famine of 1944–45 is known in the Netherlands as the Hongerwinter (literal translation: hunger winter).

Incorrect:    Philippines is a country of net emigration.

Correct:      The Philippines is a country of net emigration.

You can further explore this English grammar topic here.