The country with the largest number of lakes is Canada. 60% of the world's lakes are located there: more than 3 million lakes, occupying 9% of Canadian land.
The most arid country is Libya. 99% of Libya is covered by desert, in some areas there is no rain for decades.
Country-largest producer of opium is Afghanistan. It produces an incredible 95% of the world's opium.
Country-largest producer of oxygen in the world is Russia. In Siberia, approximately 25% of the world's forests grow covering an area larger than the continental United States, making Russia the world's most powerful processor of carbon dioxide into valuable oxygen.
The country with the least amount of forest is Haiti. Forests in Haiti are almost completely cut down. This is evident even on satellite images: you can determine where on the border with Haiti, the Dominican Republic, where the forests are still growing.