The scene is one of nature's grandest and most raw of spectacles. It is not a single event, but a relentless, river-like flow of life and death, driven by an ancient rhythm.
The transition begins not at a border, but with a change in the air.
The dry, golden plains of the northern Serengeti grow parched.
The wildebeest, a massive herd of over a million individuals, joined by hundreds of thousands of zebras and gazelles, sense the distant rain on the wind.
A deep collective restlessness takes hold. They start congregating into a single formation. And just like a starter pistol was fired, the massive herd is on the move.
The sound of thundering hooves and ochre dust clouds rises with the wind as the epic migration commences.
Dust kicked by countless hooves hangs in a thick, ochre cloud, coating everything and turning the sun into a hazy orange disc.
As they approach the Maasai Mara's verdant grassy plains border, the energy shifts from a steady migration flow to a tense, jostling bottleneck.
The air fills with a continuous low grunting ("nu-uh, nu-uh"), the sound of a million nervous conversations.
As they cross the smaller river on the border, they know the Mara river further ahead is the real challenge.
They have memories of the brown swollen torrent, and swirling with hidden currents where the dreaded Nile crocodiles await their arrival.
They also know of the bigger predatory dangers that lurk in the vast savannah grasslands of the Maasai Mara.
But the annual pilgrimage is an absolute must in pursuit of their primal destiny.
JohnMak
Cameraman - Gitanta