Kolukkumalai “The highest tea growing estate in the World” . – the tea plantation in the sky – This adventurous full day tour takes you to the Kolukkamalai Tea Estate, which is accessible only by 4-wheel drive Jeep . Kolukkumalai is situated in the mountains at a height of approximately 8000ft, set amidst magnificent scenery with views to the mountains and over the vast plains of Tamil Nadu.