Two years ago, the Cameroonian government declared war on Boko Haram. Despite some progress, the group's violent impact is still seen and felt deeply in the remote north of the country.

In March 2016, Crisis Group Analyst Hans De Marie Heungoup travelled for four weeks into an insecure area only few researchers are given access to: Cameroon's Far North Region. He was escorted three days by the military between the front-line towns of Ldamang, Mabass, Kolofata, Amchidé and Gansé, before he went on to travel alone across the region: to Maroua, the Minawao refugee camp, Mokolo, Mora, Kousseri and Goulfey.

During the four weeks he spoke to a wide range of people, including traditional chiefs, local inhabitants and administration staff, refugees and Internally Displaced Persons (IDPs), vigilante groups, local NGOs, humanitarian actors, academics, the military, former Boko Haram members, former traffickers, and others, some in presence of the military but the vast majority on his own.

He completed his research in April and May 2016 with additional interviews in Kerawa, Bargaram, Fotokol, Makary, Hile Alifa and Blangoua. An in-depth Crisis Group report on the crisis in the area will be published soon.

This is the story of his journey

At 8 o'clock in the morning, I hear seven vehicles stopping in front of my hotel: two armoured personnel carriers (APCs) and five four-wheel-drive vehicles. Sitting inside are over forty Cameroonian soldiers, who are here to take seven journalists and me into Cameroon's Far North district - a region that has severely suffered under Boko Haram, and still does.

I am joining this convoy because I want to find out how Boko Haram operates in this area, and how strong it is, two years after the government started to clamp down on the insurgency.

I want to see how the people living here are affected, understand if Boko Haram still recruits fighters in the Far North, and hear how large its network of sympathisers remains. And I want to understand what - apart from weapons - it takes to counter Boko Haram.

I am especially curious to learn about the so-called "vigilantes", local self-defence groups that have gained a certain fame in this Cameroonian war on terror. What can these groups really achieve?

The starting point of our trip is Maroua, a buzzing city of 400,000 inhabitants and capital of the Far North region. The region has never gained the sad notoriety of Nigeria's Borno state, but it gradually became an important refuge for Boko Haram fighters in the 2000s. And it has suffered immensely under the insurgency over the past years, particularly since 2014 when Boko Haram entered into open confrontation with the Cameroonian government.

The group's tactics then changed quickly: smaller incursions and occasional kidnappings soon grew into larger raids on towns and villages as well as strategic attacks against the Cameroonian army.

In just two years, the insurgency staged more than 500 attacks and incursions, and around fifty suicide bomb attacks in Cameroon, making it the second most targeted country after Nigeria. According to Cameroonian soldiers, they fought fourteen fierce battles in Kolofata, Amchidé, Fotokol and Bargaram in 2014 and 2015 against sometimes hundreds and even up to a thousand heavily equipped Boko Haram fighters from mainly Nigeria, Cameroon and Chad.

In total, in two and a half years the insurgents have killed at least 1,300 civilians, 120 soldiers and abducted an estimated thousand people in Cameroon. They have burned down hundreds of schools and businesses and forced thousands to flee. Today, there are over 190,000 internally displaced Cameroonians in the Far North and around 65,000 refugees from neighbouring Nigeria, according to OCHA figures.

Before we leave Maroua, one of the soldiers gives me a helmet and a bullet-proof vest. This will be my outfit for the entire journey, the standard equipment for everyone travelling in this once peaceful area whose broken tracks are now sown with mines and improvised explosive devices (IED).

These were laid by Boko Haram to block the government's way into the territory. More than 50 incidents have been recorded since October 2014, with 22 of the mines killing at least 30 soldiers and wounding many more.

Boko Haram leader Abubakar Shekau threatens to step up violence in Cameroon. In a video posted online, Shekau threatens the people of Cameroon and its president, Paul Biya. SABC News

I climb into a mine-resistant armoured personnel carrier (APC). But our safety has a price: despite air conditioning it's over 45 degrees Celsius inside. With sweaty faces, the journalists and I look at each other, suddenly understanding, at least slightly, the physical challenge that the soldiers patrolling the region experience each day.

Twenty kilometres outside of Maroua the roads become bumpy. And then there are no roads at all. But the driver finds his way toward the north-east and after four hours we arrive at Mabass, a village right at the Nigerian frontier. Mabass and the neighbouring towns of Tourou and Ldamang were repeatedly attacked by Boko Haram in 2014 but the insurgents never managed to fully occupy them.

We stop at a rocky plateau overlooking the vast sandy frontier area with Nigeria where the local commander, Captain Ticko Kingue, points at a lake in the distance. "You see the lake over there?" he asks. "That's the Nigerian town of Madagali. This entire frontier area is plagued by the insurgency. Even last night there were attacks. We cannot go into Nigeria, not here, we're not allowed to. So what we do is we prevent the insurgents from coming in".

It is crucial that the Nigerian and Cameroonian armies cooperate in the fight against Boko Haram. But for a long time, the two country's historically difficult relations painfully slowed down their military coordination.

Today, two years since the Cameroonian government declared war on Boko Haram, there's still a great need for better exchange of intelligence.

But at least cooperation between the two armies has improved significantly within the context of the region's Multinational Joint Task Force - partly operational since November 2015 with the aim of crushing Boko Haram.