"enter the border" is correct and usable in written English.
You could use it in a sentence like: "We crossed the frontier and entered the border without a hitch."
Mr. Sorour's truck was about 10th in line in front of the gate to enter the border zone.
Protesters in Lebanon said they received permission from the army to enter the border area near Maroun al-Ras, classified as a militarily sensitive region.
The activists have been gathering close to the Laredo crossing over the last few days, and have received briefings from the Dream Nine activists who preceded them about what to expect once they enter the border post.
I used a forged visa to enter the border and spent a month meeting the mullahs on the front lines and generally seeing what life was like under the Taliban.
2. Protecting the borders of the Islamic State from every mushrik [idolater], disbeliever, aggressor and even friend, for no army or other force is allowed to enter the borders of the Islamic State whatever the pretext.
There have been reports of people entering the border into Israel from the West Bank and relationships forming that way.
The road passes over the New River and intersects CR S31 before entering the border city of Calexico, just opposite from Mexicali, the capital of the Mexican state of Baja California.
I was raped in Somalia and then I run away from Somalia and I was raped while I was on my journey from Somalia to Ethiopia, and I entered the border and I was just newly [gave birth to] my child.
Stepping out of our Honda CRV, we enter the Goba border checkpoint, where a computer-less customs official logs us into the country.
On several occasions, people have illegally tried to stow away on board the train, sometimes in large groups, trying to enter the UK; border monitoring and security is therefore extremely tight.
"Seeing the rails enter the Scottish Borders brings home the reality that trains will be running along the railway next September," he said.
